Electrically Heated Shoe Inserts Remote Control USB Thermal Inserts with Charging Capability 35 to 40 Description: [USB rechargeable insoles] The heated foot warmer is characterized by a high temperature of 40-65, heats the entire sole of the foot, suitable for repeated use. [Comfortable Material] Heated insoles for women and men are made of EVA foam, have good cushioning, are soft, comfortable, wear-resistant and durable. [Remote control] Three-stage temperature control, low temperature 40-45°C, average temperature 50-55°C, high temperature 60-65°C. Heating time: 3,5 hours -7 hours (depends on different temperature levels) [Wide Applications] Winter Warm Shoe Inserts with Foot Warmer are universal for both men and women, comfortable to wear, ideal for various outdoor activities such as outdoor camping, fishing, cycling, skiing, hiking, outdoor work in the cold. [Perfect Gift] Electric heated inserts are also a great gift choice for families, relatives, friends for birthdays, Thanksgiving, holidays, festivals, etc. Specification: Material: EVA The package includes: 1 pair of inserts 1 remote control 1 USB cable 1 instruction manual